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Chemistry · General trends in properties of the first-row transition elements: physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic behaviour, magnetic properties, complex formation, interstitial compounds, alloy formation

Among the four successive members of the first series of the transition metals l

Among the four successive members of the first series of the transition metals listed below in the options, which one has a positive standard potential \( \left(\boldsymbol{E}_{M^{2+} / M}^{0}\right) \) value?

  • A. \( N i(Z=28) \)
  • B. \( C u(Z=29) \)
  • C. \( F e(Z=26) \)
  • D. \( \operatorname{Co}(Z=27) \)

Step-by-step solution

Standard reduction potentials for M2+/M in the first transition series: Fe (-0.44 V), Co (-0.28 V), Ni (-0.25 V), Cu (+0.34 V). Only Cu has a positive value.
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